export default {
  methods: {
    //派发--用于父子组件间通过自定义事件通信
    broadcast(componentName, eventName, params) {
      this.$children.forEach(child => {
        const name = child.$options.name;
        if (name === componentName) {
          child.$emit.apply(child, [eventName].concat(params)); //apply接受两个参数
        } else {
          broadcast.apply(child, [componentName, eventName].concat(params));
        }
      });
    },
    //广播
    dispatch(componentName, eventName, params) {
      let parent = this.$parent || this.$root;
      let name = parent.$options.name;
      while (parent && (!name || name !== componentName)) {
        parent = parent.$parent;
        if (parent) {
          name = parent.$options.name;
        }
      }
      if (parent) {
        parent.$emit.apply(parent, [eventName].concat(params));
      }
    }
  }
};
